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Exclusively for LUNA Recording System

  • Overview
  • Features
  • Customer Reviews
  • 4.7/5
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Regular Price: $299.00


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Get the punchy sound of API console summing — exclusively for LUNA.

The sound behind five decades of landmark albums, API consoles are legend for good reason. From Stevie Wonder's Talking Book and Fleetwood Mac's Rumours, to The Cure's Pornography and Radiohead's Hail to the Thief — the mid‑forward punch of API's classic analog consoles breathe aggressive, multi‑dimensional color into your mixes.

Developed in partnership with API, exclusively for LUNA Recording System, the API Summing Extension emulates the 2520 op‑amp and custom output transformer-based summing amps found in legendary API consoles over the past 50 years — giving your LUNA mixes all the attitude and tone of API's esteemed analog desks.

Easily add power, clarity, and mid-forward punch to your mixes with the first authentic emulation of API analog summing

Use per-bus Headroom and Trim controls for subtle tone sculpting over your entire mix.

Harness the complex nonlinearities and musical clipping that define the API sound

Sum individual channels or your entire mix through API's hallowed bus or master summing modules

Genuine API Summing for your Mixes

Genuine API Summing for your Mixes

Taking you beyond any summing plug‑in, the API Summing Extension is built into LUNA's mixer, capturing the sonic detail of API's iconic bus channels. This workflow eliminates the need to manage multiple plug‑in windows. Simply push up faders and use the per‑bus Headroom control to add character and dynamic enhancement.

Why API Summing?

Why API Summing?

When audio sources flow through an API console — specifically the 2520 op‑amp and custom output transformer — random analog nonlinearities work together, producing complex, musical harmonics and transient clipping. These summed signals add punch, depth, and character for a mid‑forward, lively mix.

Getting it Right

Getting it Right

UA dissected and studied multiple API consoles — pouring over original service manuals and gaining crucial insight into their discrete Class A operation and hybrid voltage/current summing circuitry — in contrast to the Neve 80 series pure current summing. UA's team of engineers throughly emulated all of the nonlinearities and clipping characteristics, plus API console fader taper and pan law, giving you the same chart‑topping results as API's flagship consoles.


The first authentic emulation of API analog summing

Adds power, clarity, and mid-forward punch to your mixes

Per-bus Headroom and Trim controls for professional tone sculpting over your entire mix

Sum individual channels or your entire mix through API's hallowed bus or master summing modules

Customer Reviews

API Summing

Overall Rating


L. Brown

October 10, 2023

A+ Sweet

A+ Sweet

A. Cengic

July 22, 2023

I love it

Use on every BUS :D

J. Sallo

July 16, 2023

API Summing

Great addition to Luna extension.

H. Powell

July 3, 2023

A P i Summing

It”s Great. I use it everyday

B. Bell

June 28, 2023

Nice Smooth Punch

Adds some nice midrange punch to your mix.

M. Brown

June 12, 2023


As a new LUNA user, this is one of my favorite plugins. Really ties the room together.

Y. Sagarra Rodriguez

April 1, 2023


Merece las 5 estrellas aunque me gustaría usarlo en otros DAW.

V. Silva

March 31, 2023


I just didn't give it 5 stars because it's impossible to use it in another DAW. But the sound is incredible, what it does in the low end I couldn't find in any other plugin… It's worth it and I can't live without it in my mixes anymore

P. Oliveira

March 3, 2023


It's really incredible what this plugin can do. I was really skeptical since I'm used to real analog summing but it sounds amazing. Best buy in months and if you need to choose between the Neve and the API plugin I'd stay with the API first, for a cleaner and punchier feel. If you feel like to expand your options the Neve will be a good adition later on.

R. Vargas

January 24, 2023

Brining everything forward with punch

I was skeptical about this one as it wasn’t as dramatic effect as the Neve summing but flipping back and forth, I can hear that API punch and clarity everyone talks about. Can’t vouch for how authentic it is compared to the hardware but if people with API console experience dig it, it works for me.

J. Whitesides

January 24, 2023

Complete the Sum

This is a fantastic addition to completing what I'd call the API trifecta. Having the API channel strips, pre-amps, EQs, Compressors without the API Summing in LUNA is doing yourself a disservice. I've become a Summing convert, for both the API and the Neve. Whatever the mojo is, it's a much needed additional tool in the mixing war-chest for that added extra 1% to put you over the top.

E. Morgan

January 16, 2023

Just brilliant.

This is a brilliant pluging on the stereo main. Glues everything together and adds weight and punch.
I currently have this on the main of a session that's got a Zeppelin vibe, especially the drums, and A/B'ing it in/out at unity gain you can 100% hear the difference it makes to the overall mix.
Glad I grabbed this one!

S. Lopez

January 8, 2023

If you switched to Luna

Then Grab It along with the Neve, simple.

K. Houghton

January 7, 2023

I’m a summing convert!

I never used this approach in a daw but now hear a great difference on many songs and now I will have to redo many songs I thought we’re finished
Give it a shot and you’ll understand .
Happy mixing!

A. Filip

January 3, 2023

Smooth Sound

Very good on percussive material and it’s really useful for gain-staging your tracks! You can hear something’s changing only when you just put in on your bus

J. Tofte

December 16, 2022

Glues it all together

It’s like loctite for audio. Great job UA!

T. Laja

September 19, 2022

API Quality

I used in fx and mix channels. Very good and easy .

J. Lowman

July 27, 2022

only for people new to DAW.

i'm not about to switch daws for a summing plugin. although i'm not even sure if it would even integrate as easily as it does with luna. COLLAB WITH APPLE FOR A LOGIC PRO X summing SLOT PLEASEEEEEEEE!!!

M. Verblakt

July 8, 2022


I loved the Neve summing option in LUNA. That's the reason why I obtained the API summing too. This creates the all American console sound. Love it!

W. Krol

June 5, 2022

API sound

Open wide sounding API summing - and working natively, Great job